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Latest Terrestrial planets Stories

Super-Earths May Actually Be Mini-Neptunes
2013-02-04 19:14:15

Lee Rannals for redOrbit.com — Your Universe Online Finding planets outside of our own Solar System has become a bit of a hot topic in the scientific community, and the enthusiasm behind the discovery of "Earth-like" planets has been on the rise, but a new study suggests we may want to tone down our excitement a bit. A new study led by Dr. Helmut Lammer of the Space Research Institute (IWF) at the Austrian Academy of Sciences says that maybe these "Earth-like" planets may not be...

2012-11-29 16:20:19

WASHINGTON, Nov. 29, 2012 /PRNewswire-USNewswire/ -- A NASA spacecraft studying Mercury has provided compelling support for the long-held hypothesis the planet harbors abundant water ice and other frozen volatile materials within its permanently shadowed polar craters. (Logo: http://photos.prnewswire.com/prnh/20081007/38461LOGO) The new information comes from NASA's MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft. Its onboard instruments have been...

Diamond Planet
2012-10-11 12:25:19

Lee Rannals for redOrbit.com - Your Universe Online One nearby super-Earth planet could have a lot more "bling" on it than our planet, because astronomers say it maybe a diamond planet. Yale University scientists reported in the Astrophysical Journal Letters that the surface of 55 Cancri e is likely covered in graphite and diamond, rather than water and granite. The planet has a radius twice of Earth's, and a mass eight times greater, allowing it to fall into the classification...

Super-Earths May Not Be As Earth-Like As Name Suggests
2012-09-26 14:10:34

Lee Rannals for redOrbit.com — Your Universe Online A new study presented at the European Planetary Science Congress on Wednesday shows just how rare our Earth really is. Super-Earths are out there, and exoplanet hunters estimate there could be billions of the planets. However, the new research suggests that just because they are Super-Earths, doesn't mean they are capable of hosting life. "We are discovering planets orbiting distant stars that are similar to Earth in...

Mickey Mouse on Mercury
2012-09-19 12:08:29

Lee Rannals for redOrbit.com - Your Universe Online After spending the last year-and-a-half orbiting Mercury, NASA's MESSENGER spacecraft is revealing new information about the planet that lies closest to the sun. New x-ray data from the space probe shows that the planet contains high levels of magnesium and sulfur on its surface, making its composition quite different than that of other planets. MESSENGER's X-ray spectrometer shows a planet whose northern volcanic plains formed...

2012-09-05 02:21:48

SAN DIEGO, Sept. 5, 2012 /PRNewswire/ -- NASA's Project MESSENGER spacecraft returned photos of Mercury's surface revealing "... an unusual landform on Mercury, characterized by irregular shaped, shallow, rimless depressions, commonly in clusters and in association with high-reflectance material." Mercury is the only rocky planet where such surface-features have been observed. NASA scientists recognized that the "pits" appear to have formed from volatile-related activity, but were unable to...

BepiColombo Gets Good Vibrations
2012-08-17 12:12:16

[ Watch The Video ( BepiColombo Vertical Vibration Test ) ] [ Watch The Video ( BepiColombo Vibrating Horizontally ) ] Mimicking the intense vibrations experienced by a satellite during launch, the engineering model of the BepiColombo mission to Mercury has been subjected to similar forces at ESA´s spacecraft test facilities. A major design issue for spacecraft arises from the intense environment experienced during launch, ranging from vigorous vibrations to deafening noise. It...

Why Is The Sun So Perfectly Round?
2012-08-17 07:40:10

April Flowers for redOrbit.com - Your Universe Online On a summer's day, the sun dominates the sky looking for all the world like a big, round ball of light. Round is exactly what it is, it turns out. It is nearly the roundest object ever measured, according to a study from the University of Hawaii's Institute for Astronomy. If you scaled the sun down to the size of a beach ball, it would be so round that the difference between the widest and narrowest diameters would be much less than...

MESSENGER Marks 8th Anniversary Since Launch
2012-08-06 09:33:40

John Neumann for redOrbit.com - Your Universe Online Eight years ago this month, in 2004, the MESSENGER space probe was launched on a six-and-a-half year, 4.9-billion mile journey to be the first spacecraft to orbit the planet Mercury. The leisurely cruise included 15 trips around the Sun, a flyby of Earth, two flybys of Venus, and three flybys of Mercury. During its gravity assist swing-by of Earth, on August 2, 2005, Messenger´s cameras captured several hundred images of our...

Vaporizing Super-Earth Helps Characterize Exoplanet Attributes
2012-08-03 14:45:31

Lee Rannals for redOrbit.com - Your Universe Online Scientists collaborated recently to produce simulations of Earth-like planets being vaporized in order to help astronomers have a better grasp of what to look for in the atmosphere of candidate super-Earths. Super-Earths are rocky exoplanets that are more massive than Earth, but less massive than Neptune. Most of those that have been found so far orbit very close to their stars. Scientists writing in The Astrophysical Journal show...


Latest Terrestrial planets Reference Libraries

6_ca87660286bca43fbd7e3f90543baaa72
2004-10-19 04:45:42

Terrestrial Planet -- A terrestrial planet is a planet that is mostly composed of silicate rocks and may or may not have a relatively thin atmosphere. The term is derived from the Greek word for Earth, so an alternate definition would be those planets that are more Earth-like than not. Terrestrial planets are very different from gas giants, which may or may not have solid surfaces and are composed mostly of hydrogen and helium in various physical states. Only one terrestrial planet,...

4_eccd202c9b173d8cc2bddcaa6629203b2
2004-10-19 04:45:40

The Planet Venus is the second planet from the sun. It is often called the evening star or morning star and is brighter than any object in the sky except the sun and the moon. Because its orbit lies between the sun and the orbit of the earth, Venus passes through phases like those of the moon, varying from a large bright crescent when the planet is near inferior conjunction (nearest the earth) to a smaller silvery disk when it is at superior conjunction (farthest from the earth). Since...

4_9748baf12fb7dd89aa4315d7732196cd2
2004-10-19 04:45:40

The Planet Mercury -- in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon as it completes each revolution about the sun, although the visible disk varies in size with respect to its distance from the earth. Because its greatest elongation is 28, it is seen only for a short time after sunset or before sunrise. Since observation of Mercury is...

4_81f631e16d8d1d35870c180f342c83a12
2004-10-19 04:45:40

The Planet Mars -- in astronomy, 4th planet from the sun, with an orbit next in order beyond that of the earth. Physical Characteristics Mars has a striking red appearance, and in its most favorable position for viewing, when it is opposite the sun, it is twice as bright as Sirius, the brightest star. Mars has a diameter of 4,200 mi (6,800 km), just over half the diameter of the earth, and its mass is only 11% of the earth's mass. The planet has a very thin atmosphere consisting...

4_33609f8ebef994f54be143abe0bef9f42
2004-10-19 04:45:40

Earth -- in geology and astronomy, fifth largest planet of the solar system and the only planet definitely known to support life. Gravitational forces have molded the earth, like all celestial bodies, into a spherical shape. However, the earth is not an exact sphere, being slightly flattened at the poles and bulging at the equator. The equatorial diameter is c.7,926 mi (12,760 km) and the polar diameter 7,900 mi (12,720 km); the circumference at the equator is c.24,830 mi (40,000 km)....

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